Dipper-tooth.



V. c. THOMAS.

Patented Mar-.231909.

lllll VALENTINE o. informs, o

PATENT F GARROLLTOWN PENN SYLVANIA.

no. nii-goo specificano-n of fili Iwhom lima/11,' concern: it known thatl, VALENZEINE (1. ri. oitizen of the United State Carrolltown, in lli@fllnlo ol Ponnsyl THQMAS, s, residing at County of Cambria and Vania,have invnnted :l new i ity. Vllhere the surface area of tl1e.tootli midminimi DippvrlooLli, of which lille folor toohpoint dint is exposed towoaris oonli'm'ing; in a specification. l stamt, the tooth may be Welladapted for the 'lliis invention relates 'bo dipper tooth for diggingofsoft earth or gravel, but would in connection with excavating;machines, soon vbecome dull if employed in connection 65 in stromshovels, ditching machines, `mid the with the digging of hardermaterials, suoli lilm :is shale or solid or soft rook. lircarrying lioprinoipl olajooi of the invention is-o oula the present invention,therefore, proprovide a novel form of flipper ootli having vision isrunde for nroporvioning the area o roi'novallle point of such simpa andso pri` exposod to worn' in accordance with the char--70 3 5-poi'lionefl as to il@ practically ,self sharpenacier of the work loboperfori'ned. and to .always present al @harp odge 'For The ootl'i lisis@10 is provided with the eng Hamont with the work'. usual upper and lowershrinks 11. and `12, fnrlilxnr object of 'this inv'rntion ils o pro-@pained to fd @vor the lip of the shovelnnd.

t Vido n reniomljilo tooth point having alweiii'- provided with 'Eliousual. openings for .iho 75 2o ngi surface oli/in aren. proporionvd tolieV priszigoolf securing dem" f.

degree of penerbiliy of the maorial being Projecting from tho la wird.-end of the. @para d upon, so ylisi; difieren?, 'points may lease is apoined shank l5, the has@ of whioh' lm nood for suoli materiali; as hardrook, soft is approxinmtoly rrotangular in cross sectiony fool-z, lizarddirt or Shale, or lsoft north or 'and is of less cross sectional arno.than the 80 gfrfwel. l g v main portion oll'io molli in order lo form auil ith illes@ and ll-lier olijnons in vit-,WQHS square shoulder lllagainsl: which the. y.rear will moro, fully hereinafter appoar., the inend of tho toothpoinlzniay abut.' ilielowor vonlon lomiis's in ortainnovel 'leati'ircs surface. 17 of lli@ isl'innl; is continued oul in-A o?corwlzruoion and nrriingem in of parts,genoralpfzrfilli-xlrelationwil/lithetooth propeig 30 marcilla-flyerfullydossi-ined, illustri-ted'in th Wliilo tho 'upper 4surfmzi 1S loperslowlyA nonompnny'ingg drmvings, and "particularly ward nl; aconsiderolil-r angl@ toward n. point pointed mil/in tlionnpnnded claims,it lining Il). The oiwirrd @nl of the lower Snrfauf iindvrslloml -lzvarious chang-ns in the form, tapers upward, 'as indicated al# 120,`toward progloi'lion, size and minor details of the L-lxo poin. Thisshank tapers slightly in 90 tir/lure may llo inode Without departingwidlhifrom in@ lmfao ownn five point, and is 'om lli@ spirit orsacrificing :my of tive ad pronidnd with im opmiing i ill@ passim@.ogres of the invnntion. l of a river, 'ooit orotlier :so/dining, do fr,sur. 1 mminipanyingf drawings,:--Fi.gnre indimtod al. 2li. llw'slmnl n..ilwgr .is

l is n. w :al socion oi a. slipper totli'con l zirrmigrd to rwfrivepoinlsofsliglily(lil'rrent 95 fifa Strani/nd in xxcooidzmre with theinwn'tiou, ,con.--zirnoio,fi, imliraii'rd in lligs. 2, 3. Aand iii@rcmoalilo ,ooin applied vlireto being; 5 in nocordnnr-,v wilirlliorlinrncl'nr oiworl: inlonded for use in. {'oiin-uolioi'i with tho to lmwrl'oljnml. All ol' llirrw points are oi' ing of lmrd or solid rock.Fig'. 2 is n ilu. milio general contour, lwing slightly .moc'fivo virwof lie i'ooli imac ziyws'il in. widll from l'lw real ond lo'l'lxo 10S 23imm rook' ligging (Rolli dotzwliml. poinl, mid tlloir lowor Mors livingar mrspemiw 'viow of lilw l dir or simio. i .similar virw of llir`zmolwidin? point Hnpoyod in digging soli Fig. 5 is a. similar View ol'l'. wnployod in ille digging is; a. plan View ol4 the s nl: iff-ii'oromiare employed pon'lingj [mi-is tlironglimlt. uw; nl" U10 drawings.

I In di itI is practically impossible to uso the saine shovel, and teethproper in the digging of" materials of different degrees of ponetrabil-6G lo lowor lo llio upper downward from Carli-ol' lor thoy roi-optionol' lli@ Shank, and the*y cross sootioiml cordoni' oi llw point is suolilifit its roar ond will abut :squzlroly against the. slionli itsSurinam: will lol-ni conliinlalions ol' tlm l similarsnrfnwof lilo lumimmlmr Il). rl`l| r I sharp, i'liisol like` odge 2o ib` formed. the.pointsl is hollow pper teeth as ordinarily constructed, A

liuI rom.' 0nd toward tlm point, .so that :i 10E lor lli and all nl''11' -wear away in common with t `This slidingfriction on the lowersurface of the tooth will wear the metal away and the wear is eatestnear the point ofthe tooth and grarially lessens toward its base or rearend. "In order, therefore, to provide a point that will wear evenly,and, therefore, will always remain sharp, the area of this lower surfaceis increased or diminished in accordance with the character of the work,thus in the construction shown in Figs. 1 and 2 the entire lower surfaceof 'the removable point is solid, and this point is ada ted for thediggin of hard rock where the s iding friction wil wear the entire lowersurface of the point, while for a point adapted for digging softermaterial, a portion of its area is cut away.

In Fig. 3 is shown a point adapted for the digging of hard dirt orshale', and it will be noted that in this casethere is an opening 30formed immediately rearward of the digging edge presenting for aconsiderable portion of the tooth only a pair of edges which will at.portion ofthe lower surface of the point between the opening 30 and thechisel point.

In Fig. 4 is shown a tooth adapted forthe di ging of soft earth orgravel,- where there isgless frictional resistance and in this casealmost the entire lower surface of the point is cutj away in order tomaterially reduce the amount of metal to be worn away for thepurposeofmaintaining the digging edge sharp.

In Fig. 5 is shown a point that is adapted for the diggin ofcomparatively soft rock.

Inthis case t e frictional wear is greatest near the point and the lowersurface of the tooth is solid for more than half its length, a portionof the lower surface being cut away near the rear end of the tooth so asto reduce the frictional area at this point.

Itwill be seen that in all cases the friction -I or wearing areaisproportioned to the degree of penetrabili y of the material, and thelower surface of the gint will therefore remain'fiat and the c"Sel likeedge will be preserved until the removable point is entirel worn out.hat is claimed isz- 1. A shovel tooth of the type described having aremovable point provided with a frictional wearing surface of an areacorresponding to the degree of penetrability of the material being actedupon.

2. Ashoveltooth havinga removable point, said point having a lowersurface resenting a frictional wearing area correspon ing to the natureof the material being excavated.

3. A shovel tooth comprising a base and shank, and removable pointsarranged to be attached to said shank, saidpoints having frictionalwearing areas of different extent.

4. A shovel tooth com rising a base, a

shank extending from the orward end thereof and interchangeable diggingoints arranged for attachment to said s ank, the points havingfrictional wearing areas of different extent to correspond to the degreeof penetrability of the material being operated upon.

5. A shovel tooth having a detachable point, a portion of the area ofthe lower surface of said point bein cut away to reduce the amount ofmetal in rictional engagement` with the material being excavated. 4

6. A shovel tooth having a movable point, the frictional area of thelower surface of the point being less than the entire supericial n areaof said lower surface.

7. A shovel tooth comprising a base, a shank member extending from theforward end thereof and having a cross sectional area of less than thatof the base to form an abrupt rectangular shoulder, and a removabledigging point recessed for the reception of the shank, the base of thepoint bein of a cross sectional area corresponding to t iat of saidbase. l

In testimony that I claim the foregoing as my own, I have hereto affixedmy signature in the presence of two witnesses.

VALENTINE o. TIioMAs.

Witnesses M. F. NELSON, NELLIE EYEB.

